Fire-alarm system.



110 870 574. Humanov, 12, ;907.

' 0. W. MsD-ANIBL. FIRE ALARM SYSTEM.

APPLICATION FILED APR. 23, 1906.

Ch 1 1 'wfi i i E? E5 ERIE wmmw CHARLES W. MCDANIEL, OF KANSAS CITY, MISSOURI.

Finn-ALARM SYSTEM.

To all whom 'it may concern:

Be itknown that 1, CHARLES W. McDANmIl', a citizen of the United States, residing zit Kansas City, in the cdunty of Jackson and State of Missouri, have invented a certain new anduseful Improvement in Fire-Alarm Systems, of which the following is 5. full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to alarm systems, particularly to a system adapted for association with a. telephone system.

In my'system an ordinary rheotome bell is included in a circuit controlled by thermostat devices which upon being heated 'to a predetermined degree cause closure of the circuit and actuation of the alarm bell. In the circuit I also include a primary winding of'an 'electromagnet which also has a secondary winding, whose one terminal connects'with the front contact of an armature, which armature and theqther terminalof thesecondary winding connect with the telephone connects her cord circuit with the line in the usual t0 the accompanying drawings, wherein I have din-- line limbs leading to the telephone central exchange. The adjnstment is such that when the alarm bell circhat is closed the secondary circuit will also be closed to cause actuation of theindicating signal at the central exchange. The alarmbell will. serve to notify the inliabitant's or watchman of the premises if they are present. The central operator upon receiving the signal manner and connects. in her operators set. The secondaryiwinding is of such adjustment that a. humming noise will be produced in the opemtors ear piece which immediately notifies her that. the alarm circuit at the sirhscribers station has been actuated, If the inhab itants orwatchman, when the alarm is actuated, are absent, central can then take steps to find them to notify them of the fact. Undcr normal conditions, however, this alarm circuit is cntircly independent of the telephone system. e a I Myinvention will be best understood by reference grammatically illustrated an alarm circuit and .a telephone circuit leadingto a central exchange.

In the limbs ab of the alarm circuit are included a battery 1, the primary winding 2 of an electroniagnot 3 and the alarm bcl14. The thermostat devices 5-5-.5 are normally opcn'and arranged in multiple between the/line limbs. When one or more of these thermostat devicesarc hearted beyond a. certain degree, as in case of fire in their vicinity, they nreaficctcd to close the alarm circuit and the alarm bell armature 6 is vibrated to ring the bell and to rcpcntcdlyopcn the circuit in the well known manner. On the clectromagnet 3 is also a seconary winding 7, whose one terminal connects with the first contact 8. The other terminal of this secondary winding and the armature'l) for the electro Specification of Letters Patent.

Application filed s in 23. 1906. Serial 1%. 313.175.

Patented ms. 12, 1907.

I magnet connect through conductorsflo and 11, respec-- tively, with binding posts 12 and 13 of the telephone line T, whoselimbs 14 and 15 extend to the central exchange C. At the central exchange any Well known telephonic mechanism may be employed and I have shown'a line relay 16 engaged by the windings l7 and 18 in the line limbs 14 and 15, respectively, the common source of current 19 being normally in bridge of the line limbs. The line relay armature 20 controls 'circuit 0. In the-cord circuitis the usual op'eratbrs key 1: adapted when actuated in one direction to con- .nect with the cord strands the operators telephone set 0, and when actuated in the other direction to connect -with the cord strands the generator g. At the station is the ordinary telephonic apparatus comprising the transmitter 24, primary winding 25, the reeiver hook 26, secondary winding 27 and the receiver 28 normally in place on the hook,-the circuit through the receiver circuit being normally closed. A-signnl nected between the line limb 14 and through the receiver hook with the line limb 15.

ordinary circumstances, the telephone and alarm systems are entirely independent of each other as the secondary-wircuit including the secondary winding is normally open as the armature 9 is Inormally out'of engagementwith the contact 8. Upon actuation of a thermostat device, however, the alarm circuit becomes affected, as before stated, and is-rcpeatedly opened and closed uponwibration ofthe :rrnnturc 6 into and out of engagement with its contact 6. Interrupted current therefore flows through the primary winding 2 of the clcctromagnet. This clcctromagnet immediately becomes energized to attract the armature 9 into engagement with the cont'zict 8, thereby closing a secondary circuit through the line limbs, through the indicating relay windings and through the source of current at the central exchange. The line relay becomes energized and the line lamp 21 illuminated in answer to which the operator inserts the plug 23 into the springjack and actuates her key to connect her oper- .ators set in circuit in iinticipation of a, call, from the subscriber. The secondary winding of the electronating current induced therein from the primary circuit causes a humming noise in" the-operators receiver to send signaling current to the signal hell g9 at the the local circuit for the indicating lamp 21. A springjack 22 is connected across the line limbs and adapted- .for connection with'a plug-23 connected with the cord bell 29 in series with a condenser 30 is normally, conmagnet, however, is of high resistance and ihe alter- The operation of the system is now apparent. Under V which informs her that the ale r111 circuit is effebtive. ltthe inhabitants or watch-than are present they will hear the alarm and will be notified oi the danger.

30 ondary circuit: by switch 31. Many other arrange substation to assist in arousing, the inhabitants .or the watchman. If any one is near the telephone will be answered and central knows that the danger hasbeen v discovered. A switch 31 may be included in the sec- 'ondary circuit at the telephone to remove the buzzing noise and to allow conversation. If no one is near, the central operatorwill get no answer over the telephone and she can then notify the proper persons that the alarm circuit connected with a certain line has been actuated. The thermostat devices may be remote from the alarm bell and telephone, and the telephone also, need not be in the same building .with the alarm hell or thermostat devices, but may be remote thereirom, as for instance, the alarm circuit might be in a factory to'arouse the watchman in case of fire or other danger, and the telephone may be at. the owners house-z The watchman and the central exchange would be notified immediately upon actua tion of the alarm' circuit and the central operator can then ring the telephone. to notify the owner. The electromagnetlland its windings may also be given various adjustments. The armature 9 may be slug gish to be reiained in its attracted position by the efforts oi the primary winding alone! The adjustment may also be such that when the armature is first attracted the secondary circuit, including the secondary winding and the "central supply source, -will be closed to maintain-energization of the"'electromagnet and 'the armature again released upon opening of the secments and adjustments will also suggest themselves without dcparting'i'rom the scope or spirit of the ininvention. 1 do not,'thereiore, wish to be limited to the arrangement shown. f I claim as new,"howevcr, and desire to secure by' Letters Patent! I p 1, in a combined alarm and telephone system, the combination with a telephone line leading from u substation to a central exchange, oi an alarm circuit at the substation, 40 a source otdh'ccl. current and o. rheotomc nlnrnrbcll for said alarm circuit, thermostatic mechanism for controlling the alarm circuit, on electrou ngnct having -n primary winding included in said ulnrm circuit, a secondary windlug for thcelectrolnngnct adopted for connection with the telephone line, the armutureofl said electrofnugnet being normally disposed to open the secondary circuit, and slg nnling npparntusnnd a source 01' currcntnt the central ex: change, actuation of the ulurnl circultcuu slng actuation oi'ibc olcctromngnct to close the-secondary circuit, where- I upon induced current will lioW through the secondary c'ircuil. and the telephone line lo cnuse actuation of the sig 'unllng apparatus at the ccntrul exchange.

2. in u combincd'dlnrm and telephone system, the combinniion with a telephone line leading from a. substation lo a ci-ntrnl cxchung-, of an alarm cl'rcuitnl: the substalion, :1 source of current and u rhootome' alarm bell for the alarm circuit, thermos-tut controlling means for the alarm circuit, un clccirolungnct huvingn-prlulnlywinding included in the alarm circuit, 11 secondary winding for the clcctrounignct, one terminal of the secondary winding being cunnccicdwith one or the line limbs, the other terminnl of Lhe secondary winding being adapted for connection, wilh the other line llmh upon actuation of the electromngncl armature, signaling npparutus and a source 0t current at the central exchange. und operator's telephone apparatus at ihc ccntrul cxchnngc nduplcd rmconnection 'iiii the telephone iiuc, nclnniion oi the ulurm circuit i causing uciuuiion of Li: ch'clroinngnct nrluulure to clone lln: sccundm'y clrcull whereby lhc slgnuling ilpptlllllll It [he control exchange lsnciuntcd and \vlu-rchy current flow electromagnet in inductive relation with the primary is induced iii the secondary circuit to ouse the noise in the operator's telephonic apparatus upon connection thereof with the telephone linein response to the signaling nppnrntus.

3. in no alarm system, the combination of a main alarm 5 circuit, a source of current and an alarm apparatus insuld clrcull, circuit controlling means for the alarm circuit, an clectromnghcthuving a winding included in said-alarm circuit, a secondary winding for said clectromnguet, an nuxlllary alarm circuit adapted to include said secondary winding but normally held open by the armature ot the clcctrolnngnet, and alarm or signaling mechanism in said auxiliary circuit, actuation of the main alarm circuit causing first closure of the auxiliary ulnrm circuit and 7 then induction of current flow therein to actuate the alarm 5- mechanism connected therewith.

-i. lnnn alarm system, the combination with a main alarm circuit having :1 source of current and alarm mechnnlsm, an clectromagnet halving a primary winding included in the alarm circuit, a secondary winding for the winding, a secondary alarm circuit adapted to include the secondary winding upon actuation of the electroinngnct -ornnrturc when the alarm circuit is actuated, a source of current for thesecoudary circuit, and alarm apparatus for the secondary circuit, actuation of the main alarm circuit causing attraction of the electromugnet armature to close the secondary circuit whereby the source o1 current in said secondary circuit supplies current through the secondary winding to maintain actuation of the elcctromagnet armatore, said secondary circuit then receiving induced current from the primary winding, which in uced current causesactuutlon of the alnrrnmechanlsm c nnected with the secondary circuit. I

5. in an alarm system, the combination with a main ulurm circuit having a source of currentnnd a rheotome bell, unclectromugnet having a primary winding included in the alurnrclrcult, a secondary wlndin gl-tor the electromagnel: in inductive relation with the prlinury winding, a secondary alarm circuit adapted to include the-secondary winding upon actuation of the electrumugnet armature when the alarm circuit is actuated, a source of current for the secondary circuit, and irlarmtmechanism'dor thesecondary circuit, actuation ot the main alnrmclrcuit causing attraction ot the electromsgnet armature to close the secondary circuit whereby the source of current in said secondary circuit supplies current through the secondary winding to maintain actuation of the electromagnet arms-- ture, said sccondaryclrcult then receiving induced current from the primary winding, which induced current causes actuation of the alarm mechanism when connected with the secondnry'clrcult.

o. In an alarm system, the combination of a main alarm circuit, a source of current and an alarm apparatus in said circuit, thermostatic controlling nicchanismjtor the ulurm' circuit, an electromngnet having .a primary winding included in said alarm circuit, a secondary winding (or suid'elcctromagnct, an auxiliary alarm circuit adapted to include suid scconda'ry winding but normnlly'held open'by the armature oi? the eleclromagnet, and alarm or signallng mechanism in said auxiliary circuit, actuation of the main :llurni circuit causing first closure of the auxiliary-- ularm circuit and then induction of current ii'ow therein to actinite the nlurm mechanism connected therewith.

7. in an alarm system, the combination of a main alarm circuit having a source of current and, alarm mechanism, thermostuth: controlling devices in said main alarm circult, an clectromagnet huvlng a. primary winding ln- .ciuded in the alarm circuit, a secondary winding tor the -electromagnct ininductly e relation with the primary winding, a secondary alarm circuit adapted to include the secondary circuit upon actuation of the clectromag'net armature when the alarm circuit is actuated; asour'ce 0t cur-- rent for the secondary current, and alarm mechanism for the secondary circuit, actuation of the mlin alarm circuit causing attrucilontof the electromagnet armature to clone he secondary circuit, whereby the source of current in said secondary circuit nupplleu current through the low ond ry winding to mnlntuln actuation of the electroinngnet, armature, said secondary circuit lhcn receiving induced current from the primary winding, whlcncurrent causal 870,574i l c:

actuation of the alarm mechanism when connected with the secondary circuit, 5

8. In an alarm system, the combination of a main alarm circuit, a source of current and a riieotolne bell in said circuit, thermostatic mechanism for controlling the, aiurm circuit, an eiectromugnet' having a primary winding included in said alarm circuit, :1 eecondary winding tor said electromngnet, an auxiliary ulurm circuit adapted t p include said secondary winding 'upon actuation oi the electromagnet armature wlien the alarm circuit is actuated, a spurce of current for the sieconciary'circnit, and alarm apparatus for the secondary c'ircuit, actuation 0f the main alarm circuit causing nttrnction of the clectromugnet.

armature to close the secondary circuitwt enytne source of current in said secondary ci-vcuit-vsuupiieu current tlircugh the secondary winding {QF-'-"-%EIKB 3 the electroniagnet armature, sand secomiary circuit then receiving induced current from the primary winding, which induced current causes actuation 6f the alarm :hcchaniern connected with the secondary circuit. 1

In witness whereof I hereunto subscribe my name this 

